FI83146B - Method for collecting low-grade timber for raw material and fuel for industry - Google Patents

Description

83146

A method for harvesting small wood as an industrial raw material and fuel

The invention relates to a method for harvesting small wood into an industrial raw material and fuel, in which method wood chips from wood are obtained as cleanly as possible, i.e. with a low content of bark and green matter.

According to the prior art, the pulpwood is already pruned in the forest and 10 are transported in 3 ... 4 m long pieces to the mill. The shell is removed from the hulls in large shell drums, where the shell detaches effectively as the frames rub against each other. The shell material is then separated off and the trunks are chipped. The handling of trunks requires special equipment in many stages of the harvest chain. Harvesting small timber currently requires a relatively large number of work steps, which strains the profitability of such a harvesting chain.

Another proposed harvesting chain is one in which small wood is already chipped in the forest or at least before long-distance transport. However, the cleaning of the chips 20 constitutes a major problem which has not yet been satisfactorily solved by the prior art. The crude wood chips obtained cannot be fully utilized as a raw material in the production of pulp.

It is an object of the present invention to provide a novel wood harvesting chain for producing pure wood chips as an industrial raw material. The characteristic features of the method according to the invention are set out in claim 1. According to the invention, in particular the long-distance transport of wood takes place as a coarse pulp product, whereby its handling is simpler than that of trunk wood. However, peeling and separating the shell can be effective due to the large size difference. Most preferably, the coarse pulp is made from impatient whole wood, with few different work steps, the pulp to be transported is easy to handle and compact, and the chips obtained as the final product are clean.

In the following, the invention is illustrated with reference to the accompanying figure, which shows a timber harvesting chain according to the invention.

Claims (5)

1. A process for accommodating shrubs and small trees in order to provide raw material for the industry, as well as fuel, according to which wood process is extracted as clean as possible, ie. that the bark and chlorophyll content of the chips is low, characterized in that the accommodation process comprises the following phases: bulk, debarking occurs in a rotating drum where the pieces of wood are brought to one another, whereby the bark loosens the bark and chlorophyll is removed by sowing, the clean pieces of wood or the clean wood are chopped 1. Menetelmä pienpuun korjaamiseksi teollisuuden toucha-aineeksi ja polttoaineeksi, jossa menetelmässä aikaansaadaan puusta mahdollisimman puhdasta haketta, ts. jonka kuori- ja 30 viherainepitoisuus on vähäinen, tunnettu siitä, etä puunkor-juuketjuun kuuluu seuraavat vaiheet: puut katkotaan 5-30 cm: n pituisiksi pätkiksi tai pilkkeiksi en kaukokuljetusta, jolloin niistä muodostuu suoritetaan pyörivän rummun avulla, jossa puupätkät saatetaan iskeytymään toisiansa vasten, jolloin kuori irtoaa, I: 3 83146 kuoriosa ja viheraines erotetaan puupätkistä seulomalla, - puhtaat puuainespätkät tai pilkkeet 2. Patent tivaatimuksen 1 mukainen menetelmä, tunnettu 5 siitä, etä puut katkotaan ilman karsintaa sanotunlaisiksi pätkiksi tai pilkkeiksi. 10 Patent Claims 2. A method according to claim 1, characterized in that the trees are attached to the above-mentioned pieces or to tapwood without barking.